html,
body {
    height    : 100%;
    overflow  : hidden;
    background: #f7f7f7;
}

.error-page {
    display        : flex;
    align-items    : center;
    justify-content: center;
    text-align     : center;
    height         : 100%;
    font-family    : Arial, "Helvetica Neue", Helvetica, sans-serif;
}

.error-page h1 {
    font-size  : 30vh;
    font-weight: bold;
    position   : relative;
    margin     : -8vh 0 0;
    padding    : 0;
}

.error-page h1:after {
    content                : attr(data-h1);
    position               : absolute;
    top                    : 0;
    left                   : 0;
    right                  : 0;
    color                  : transparent;
    /* webkit only for graceful degradation to IE */
    background             : -webkit-repeating-linear-gradient(-45deg, #71b7e6, #69a6ce, #b98acc, #ee8176, #b98acc, #69a6ce, #9b59b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size        : 400%;
    text-shadow            : 1px 1px 2px rgba(255, 255, 255, 0.25);
    animation              : animateTextBackground 10s ease-in-out infinite;
}

.error-page h1+p {
    color      : #d6d6d6;
    font-size  : 8vh;
    font-weight: bold;
    line-height: 10vh;
    max-width  : 600px;
    position   : relative;
}

.error-page h1+p:after {
    content                : attr(data-p);
    position               : absolute;
    top                    : 0;
    left                   : 0;
    right                  : 0;
    color                  : transparent;
    text-shadow            : 1px 1px 2px rgba(255, 255, 255, 0.5);
    -webkit-background-clip: text;
    -moz-background-clip   : text;
    background-clip        : text;
}

#particles-js {
    position: fixed;
    top     : 0;
    right   : 0;
    bottom  : 0;
    left    : 0;
}

@keyframes animateTextBackground {
    0% {
        background-position: 0 0;
    }

    25% {
        background-position: 100% 0;
    }

    50% {
        background-position: 100% 100%;
    }

    75% {
        background-position: 0 100%;
    }

    100% {
        background-position: 0 0;
    }
}

@keyframes fadeIn {
    0% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

@media (max-width: 767px) {
    .error-page h1 {
        font-size: 32vw;
    }

    .error-page h1+p {
        font-size  : 8vw;
        line-height: 10vw;
        max-width  : 70vw;
    }
}